Exhaust manifold



FIG. 1 is a perspective view as seen from the top and side of the exhaust manifold of my new design;

FIG. 2 is a perspective view as seen from the right side of FIG. 1;

FIG. 3 is a top plan view thereof; and

FIG. 4 is an end elevation view thereof. 

The ornamental design of an exhaust manifold, as shown. 